Corrosion protection, Waterproofing membrane and concrete protection coatings

The main areas of protection by Welesgard materials • Corrosion protection of steel structures exposed to various environmental conditions. • Protection of concrete structures exposed to various environmental conditions. • Protection of steel equipment and structures exposed to a high-temperature corrosive environment.

• Steel and concrete bridge decks waterproofing. • Long term (at least 30 years) external isolation for pipelines/pipeline parts exposed to various environmental conditions • Waterproofing • Engineering structures and equipment protection against mechanical damage and abrasion

Welesgard product range Pre-fabrication primer WG-Ferrogalvanic SP

Polyurethane coatings, moisture cured

Polyurethane pipe coatings (solvent free)

Polyurea coatings

High temperature coatings

Alkyd and acrylic coatings

Epoxy coatings

Pre-fabrication primer WG-Ferrogalvanic SP

Pre-fabrication primer. Definition and requirements Pre-fabrication primer (shopprimer) − a fast drying material, which applied as thin film on blast-cleaned steel to provide temporary corrosion protection before applying main corrosion protection system. Шоппраймер должен удовлетворять следующим требованиям:       

It must not negatively affect the speed and quality of cutting operations or welding and the strength of welds. It must not produce toxic fumes during welding and heating. A shop primer must be easily applied by automatic equipment. It must dry quickly so the steel plates can be handled within a few minutes of application. It requires good adhesion on abrasive blasted steel. It must be resistant to mechanical damages and high-temperature processes and provide good corrosion protection. It must be overcoatable with a wide range of paint systems.

Preservation line (Blasting and shop priming line) 1. Input conveyor; 2. Transportation system; 3. Drying chamber; 4. Blasting cleaning chamber; 5. Priming chamber; 6. Drying chamber; 7. Output conveyor;

Steel plates with rust and mill scaly

Steel plates after blasting clean

Steel plates primed by shopprimer

Shopprimers development Iron oxide polyvinylbutyral (PVB) shopprimers 1st generation zinc silicate shopprimers (high zinc content, 70-90% by volume)

3rd generation zinc silicate shopprimer (low zinc content, 25-30% by volume)

Water borne shopprimers

Iron oxide epoxy shopprimers Our proposition for further shopprimer development:

Zinc epoxy shopprimers

2nd generation zinc silicate shopprimers (middle zinc content, 50-70% by volume)

WG-Ferrogalvanic SP − based on combined binders (combination of few different binders type ) and very low content (< 25% by volume) of zinc pigments complex spherical (Zn-Powder) and flake (Zn-Flake) form.

Shopprimer comparison PVB

Iron oxide epoxy

Zinc silicate with different zinc content Middle

WG-FerrogalvanicSP

Low

Component number: 1C or 2C

2C

2C Protection time (DFT=20 µm):

2C

1C

3-5 month

3-5 month

8-12 month

6-8 month.

С3 < 3 year С4 < 2 year

Excellent

Excellent

Excellent

Excellent

Excellent

Excellent

Good

Excellent

Good

Хорошо

Good

Satisfactory

-Low solid content; - Limited corrosion protection - Poor resistance to thermal damages

-Long drying time; Limited corrosion protection - Poor resistance to thermal damages

Cutting (speed and quality): Хорошо Welding (speed and quality): Хорошо Health and safety: Satisfactory Conclusions: -Zinc salt formation; -High zinc fumes formation during cutting and welding;

- Limited corrosion protection; Why is this results?

Zn-Powder and Zn-Flake effect А) 20 µm Zinc silicate shopprimer with middle zinc content

Б) 20 µm WG-Ferrogalvanic SP

Contains Zn-Powder ~50% by volume Protection time 8-12 month

Contains Zn-Powder and Zn-Flake